?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / fs / jffs2 / dir.c
blobcaa9b4771033ef80623a07107f0f0458f93dc565
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
6 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/fs.h>
16 #include <linux/crc32.h>
17 #include <linux/jffs2.h>
18 #include "jffs2_fs_i.h"
19 #include "jffs2_fs_sb.h"
20 #include <linux/time.h>
21 #include "nodelist.h"
22
23 static int jffs2_readdir (struct file *, void *, filldir_t);
24
25 static int jffs2_create (struct inode *,struct dentry *,int,
26 struct nameidata *);
27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
28 struct nameidata *);
29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
30 static int jffs2_unlink (struct inode *,struct dentry *);
31 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
32 static int jffs2_mkdir (struct inode *,struct dentry *,int);
33 static int jffs2_rmdir (struct inode *,struct dentry *);
34 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
35 static int jffs2_rename (struct inode *, struct dentry *,
36 struct inode *, struct dentry *);
37
38 const struct file_operations jffs2_dir_operations =
39 {
40 .read = generic_read_dir,
41 .readdir = jffs2_readdir,
42 .unlocked_ioctl=jffs2_ioctl,
43 .fsync = jffs2_fsync,
44 .llseek = generic_file_llseek,
45 };
46
47
48 const struct inode_operations jffs2_dir_inode_operations =
49 {
50 .create = jffs2_create,
51 .lookup = jffs2_lookup,
52 .link = jffs2_link,
53 .unlink = jffs2_unlink,
54 .symlink = jffs2_symlink,
55 .mkdir = jffs2_mkdir,
56 .rmdir = jffs2_rmdir,
57 .mknod = jffs2_mknod,
58 .rename = jffs2_rename,
59 .check_acl = jffs2_check_acl,
60 .setattr = jffs2_setattr,
61 .setxattr = jffs2_setxattr,
62 .getxattr = jffs2_getxattr,
63 .listxattr = jffs2_listxattr,
64 .removexattr = jffs2_removexattr
65 };
66
67 /***********************************************************************/
68
69
70 /* We keep the dirent list sorted in increasing order of name hash,
71 and we use the same hash function as the dentries. Makes this
72 nice and simple
73 */
74 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
75 struct nameidata *nd)
76 {
77 struct jffs2_inode_info *dir_f;
78 struct jffs2_sb_info *c;
79 struct jffs2_full_dirent *fd = NULL, *fd_list;
80 uint32_t ino = 0;
81 struct inode *inode = NULL;
82
83 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
84
85 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
86 return ERR_PTR(-ENAMETOOLONG);
87
88 dir_f = JFFS2_INODE_INFO(dir_i);
89 c = JFFS2_SB_INFO(dir_i->i_sb);
90
91 mutex_lock(&dir_f->sem);
92
93 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
94 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
95 if (fd_list->nhash == target->d_name.hash &&
96 (!fd || fd_list->version > fd->version) &&
97 strlen(fd_list->name) == target->d_name.len &&
98 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
99 fd = fd_list;
100 }
101 }
102 if (fd)
103 ino = fd->ino;
104 mutex_unlock(&dir_f->sem);
105 if (ino) {
106 inode = jffs2_iget(dir_i->i_sb, ino);
107 if (IS_ERR(inode)) {
108 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
109 return ERR_CAST(inode);
110 }
111 }
112
113 return d_splice_alias(inode, target);
114 }
115
116 /***********************************************************************/
117
118
119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
120 {
121 struct jffs2_inode_info *f;
122 struct jffs2_sb_info *c;
123 struct inode *inode = filp->f_path.dentry->d_inode;
124 struct jffs2_full_dirent *fd;
125 unsigned long offset, curofs;
126
127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
128
129 f = JFFS2_INODE_INFO(inode);
130 c = JFFS2_SB_INFO(inode->i_sb);
131
132 offset = filp->f_pos;
133
134 if (offset == 0) {
135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
137 goto out;
138 offset++;
139 }
140 if (offset == 1) {
141 unsigned long pino = parent_ino(filp->f_path.dentry);
142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
144 goto out;
145 offset++;
146 }
147
148 curofs=1;
149 mutex_lock(&f->sem);
150 for (fd = f->dents; fd; fd = fd->next) {
151
152 curofs++;
153 /* First loop: curofs = 2; offset = 2 */
154 if (curofs < offset) {
155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
156 fd->name, fd->ino, fd->type, curofs, offset));
157 continue;
158 }
159 if (!fd->ino) {
160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
161 offset++;
162 continue;
163 }
164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
166 break;
167 offset++;
168 }
169 mutex_unlock(&f->sem);
170 out:
171 filp->f_pos = offset;
172 return 0;
173 }
174
175 /***********************************************************************/
176
177
178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
179 struct nameidata *nd)
180 {
181 struct jffs2_raw_inode *ri;
182 struct jffs2_inode_info *f, *dir_f;
183 struct jffs2_sb_info *c;
184 struct inode *inode;
185 int ret;
186
187 ri = jffs2_alloc_raw_inode();
188 if (!ri)
189 return -ENOMEM;
190
191 c = JFFS2_SB_INFO(dir_i->i_sb);
192
193 D1(printk(KERN_DEBUG "jffs2_create()\n"));
194
195 inode = jffs2_new_inode(dir_i, mode, ri);
196
197 if (IS_ERR(inode)) {
198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
199 jffs2_free_raw_inode(ri);
200 return PTR_ERR(inode);
201 }
202
203 inode->i_op = &jffs2_file_inode_operations;
204 inode->i_fop = &jffs2_file_operations;
205 inode->i_mapping->a_ops = &jffs2_file_address_operations;
206 inode->i_mapping->nrpages = 0;
207
208 f = JFFS2_INODE_INFO(inode);
209 dir_f = JFFS2_INODE_INFO(dir_i);
210
211 /* jffs2_do_create() will want to lock it, _after_ reserving
212 space and taking c-alloc_sem. If we keep it locked here,
213 lockdep gets unhappy (although it's a false positive;
214 nothing else will be looking at this inode yet so there's
215 no chance of AB-BA deadlock involving its f->sem). */
216 mutex_unlock(&f->sem);
217
218 ret = jffs2_do_create(c, dir_f, f, ri,
219 dentry->d_name.name, dentry->d_name.len);
220 if (ret)
221 goto fail;
222
223 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
224
225 jffs2_free_raw_inode(ri);
226
227 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
228 inode->i_ino, inode->i_mode, inode->i_nlink,
229 f->inocache->pino_nlink, inode->i_mapping->nrpages));
230
231 d_instantiate(dentry, inode);
232 unlock_new_inode(inode);
233 return 0;
234
235 fail:
236 iget_failed(inode);
237 jffs2_free_raw_inode(ri);
238 return ret;
239 }
240
241 /***********************************************************************/
242
243
244 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
245 {
246 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
247 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
248 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
249 int ret;
250 uint32_t now = get_seconds();
251
252 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
253 dentry->d_name.len, dead_f, now);
254 if (dead_f->inocache)
255 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
256 if (!ret)
257 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
258 return ret;
259 }
260 /***********************************************************************/
261
262
263 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
264 {
265 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
266 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
267 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
268 int ret;
269 uint8_t type;
270 uint32_t now;
271
272 /* Don't let people make hard links to bad inodes. */
273 if (!f->inocache)
274 return -EIO;
275
276 if (S_ISDIR(old_dentry->d_inode->i_mode))
277 return -EPERM;
278
279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
280 if (!type) type = DT_REG;
281
282 now = get_seconds();
283 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
284
285 if (!ret) {
286 mutex_lock(&f->sem);
287 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
288 mutex_unlock(&f->sem);
289 d_instantiate(dentry, old_dentry->d_inode);
290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
291 atomic_inc(&old_dentry->d_inode->i_count);
292 }
293 return ret;
294 }
295
296 /***********************************************************************/
297
298 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
299 {
300 struct jffs2_inode_info *f, *dir_f;
301 struct jffs2_sb_info *c;
302 struct inode *inode;
303 struct jffs2_raw_inode *ri;
304 struct jffs2_raw_dirent *rd;
305 struct jffs2_full_dnode *fn;
306 struct jffs2_full_dirent *fd;
307 int namelen;
308 uint32_t alloclen;
309 int ret, targetlen = strlen(target);
310
311 if (targetlen > 254)
312 return -ENAMETOOLONG;
313
314 ri = jffs2_alloc_raw_inode();
315
316 if (!ri)
317 return -ENOMEM;
318
319 c = JFFS2_SB_INFO(dir_i->i_sb);
320
321 /* Try to reserve enough space for both node and dirent.
322 * Just the node will do for now, though
323 */
324 namelen = dentry->d_name.len;
325 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
326 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
327
328 if (ret) {
329 jffs2_free_raw_inode(ri);
330 return ret;
331 }
332
333 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
334
335 if (IS_ERR(inode)) {
336 jffs2_free_raw_inode(ri);
337 jffs2_complete_reservation(c);
338 return PTR_ERR(inode);
339 }
340
341 inode->i_op = &jffs2_symlink_inode_operations;
342
343 f = JFFS2_INODE_INFO(inode);
344
345 inode->i_size = targetlen;
346 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
347 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
348 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
349
350 ri->compr = JFFS2_COMPR_NONE;
351 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
352 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
353
354 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
355
356 jffs2_free_raw_inode(ri);
357
358 if (IS_ERR(fn)) {
359 /* Eeek. Wave bye bye */
360 mutex_unlock(&f->sem);
361 jffs2_complete_reservation(c);
362 ret = PTR_ERR(fn);
363 goto fail;
364 }
365
366 /* We use f->target field to store the target path. */
367 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
368 if (!f->target) {
369 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
370 mutex_unlock(&f->sem);
371 jffs2_complete_reservation(c);
372 ret = -ENOMEM;
373 goto fail;
374 }
375
376 memcpy(f->target, target, targetlen + 1);
377 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
378
379 /* No data here. Only a metadata node, which will be
380 obsoleted by the first data write
381 */
382 f->metadata = fn;
383 mutex_unlock(&f->sem);
384
385 jffs2_complete_reservation(c);
386
387 ret = jffs2_init_security(inode, dir_i);
388 if (ret)
389 goto fail;
390
391 ret = jffs2_init_acl_post(inode);
392 if (ret)
393 goto fail;
394
395 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
396 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
397 if (ret)
398 goto fail;
399
400 rd = jffs2_alloc_raw_dirent();
401 if (!rd) {
402 /* Argh. Now we treat it like a normal delete */
403 jffs2_complete_reservation(c);
404 ret = -ENOMEM;
405 goto fail;
406 }
407
408 dir_f = JFFS2_INODE_INFO(dir_i);
409 mutex_lock(&dir_f->sem);
410
411 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
412 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
413 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
414 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
415
416 rd->pino = cpu_to_je32(dir_i->i_ino);
417 rd->version = cpu_to_je32(++dir_f->highest_version);
418 rd->ino = cpu_to_je32(inode->i_ino);
419 rd->mctime = cpu_to_je32(get_seconds());
420 rd->nsize = namelen;
421 rd->type = DT_LNK;
422 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
423 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
424
425 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
426
427 if (IS_ERR(fd)) {
428 /* dirent failed to write. Delete the inode normally
429 as if it were the final unlink() */
430 jffs2_complete_reservation(c);
431 jffs2_free_raw_dirent(rd);
432 mutex_unlock(&dir_f->sem);
433 ret = PTR_ERR(fd);
434 goto fail;
435 }
436
437 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
438
439 jffs2_free_raw_dirent(rd);
440
441 /* Link the fd into the inode's list, obsoleting an old
442 one if necessary. */
443 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
444
445 mutex_unlock(&dir_f->sem);
446 jffs2_complete_reservation(c);
447
448 d_instantiate(dentry, inode);
449 unlock_new_inode(inode);
450 return 0;
451
452 fail:
453 iget_failed(inode);
454 return ret;
455 }
456
457
458 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
459 {
460 struct jffs2_inode_info *f, *dir_f;
461 struct jffs2_sb_info *c;
462 struct inode *inode;
463 struct jffs2_raw_inode *ri;
464 struct jffs2_raw_dirent *rd;
465 struct jffs2_full_dnode *fn;
466 struct jffs2_full_dirent *fd;
467 int namelen;
468 uint32_t alloclen;
469 int ret;
470
471 mode |= S_IFDIR;
472
473 ri = jffs2_alloc_raw_inode();
474 if (!ri)
475 return -ENOMEM;
476
477 c = JFFS2_SB_INFO(dir_i->i_sb);
478
479 /* Try to reserve enough space for both node and dirent.
480 * Just the node will do for now, though
481 */
482 namelen = dentry->d_name.len;
483 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
484 JFFS2_SUMMARY_INODE_SIZE);
485
486 if (ret) {
487 jffs2_free_raw_inode(ri);
488 return ret;
489 }
490
491 inode = jffs2_new_inode(dir_i, mode, ri);
492
493 if (IS_ERR(inode)) {
494 jffs2_free_raw_inode(ri);
495 jffs2_complete_reservation(c);
496 return PTR_ERR(inode);
497 }
498
499 inode->i_op = &jffs2_dir_inode_operations;
500 inode->i_fop = &jffs2_dir_operations;
501
502 f = JFFS2_INODE_INFO(inode);
503
504 /* Directories get nlink 2 at start */
505 inode->i_nlink = 2;
506 /* but ic->pino_nlink is the parent ino# */
507 f->inocache->pino_nlink = dir_i->i_ino;
508
509 ri->data_crc = cpu_to_je32(0);
510 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
511
512 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
513
514 jffs2_free_raw_inode(ri);
515
516 if (IS_ERR(fn)) {
517 /* Eeek. Wave bye bye */
518 mutex_unlock(&f->sem);
519 jffs2_complete_reservation(c);
520 ret = PTR_ERR(fn);
521 goto fail;
522 }
523 /* No data here. Only a metadata node, which will be
524 obsoleted by the first data write
525 */
526 f->metadata = fn;
527 mutex_unlock(&f->sem);
528
529 jffs2_complete_reservation(c);
530
531 ret = jffs2_init_security(inode, dir_i);
532 if (ret)
533 goto fail;
534
535 ret = jffs2_init_acl_post(inode);
536 if (ret)
537 goto fail;
538
539 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
540 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
541 if (ret)
542 goto fail;
543
544 rd = jffs2_alloc_raw_dirent();
545 if (!rd) {
546 /* Argh. Now we treat it like a normal delete */
547 jffs2_complete_reservation(c);
548 ret = -ENOMEM;
549 goto fail;
550 }
551
552 dir_f = JFFS2_INODE_INFO(dir_i);
553 mutex_lock(&dir_f->sem);
554
555 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
556 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
557 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
558 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
559
560 rd->pino = cpu_to_je32(dir_i->i_ino);
561 rd->version = cpu_to_je32(++dir_f->highest_version);
562 rd->ino = cpu_to_je32(inode->i_ino);
563 rd->mctime = cpu_to_je32(get_seconds());
564 rd->nsize = namelen;
565 rd->type = DT_DIR;
566 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
567 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
568
569 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
570
571 if (IS_ERR(fd)) {
572 /* dirent failed to write. Delete the inode normally
573 as if it were the final unlink() */
574 jffs2_complete_reservation(c);
575 jffs2_free_raw_dirent(rd);
576 mutex_unlock(&dir_f->sem);
577 ret = PTR_ERR(fd);
578 goto fail;
579 }
580
581 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
582 inc_nlink(dir_i);
583
584 jffs2_free_raw_dirent(rd);
585
586 /* Link the fd into the inode's list, obsoleting an old
587 one if necessary. */
588 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
589
590 mutex_unlock(&dir_f->sem);
591 jffs2_complete_reservation(c);
592
593 d_instantiate(dentry, inode);
594 unlock_new_inode(inode);
595 return 0;
596
597 fail:
598 iget_failed(inode);
599 return ret;
600 }
601
602 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
603 {
604 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
605 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
606 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
607 struct jffs2_full_dirent *fd;
608 int ret;
609 uint32_t now = get_seconds();
610
611 for (fd = f->dents ; fd; fd = fd->next) {
612 if (fd->ino)
613 return -ENOTEMPTY;
614 }
615
616 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
617 dentry->d_name.len, f, now);
618 if (!ret) {
619 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
620 clear_nlink(dentry->d_inode);
621 drop_nlink(dir_i);
622 }
623 return ret;
624 }
625
626 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
627 {
628 struct jffs2_inode_info *f, *dir_f;
629 struct jffs2_sb_info *c;
630 struct inode *inode;
631 struct jffs2_raw_inode *ri;
632 struct jffs2_raw_dirent *rd;
633 struct jffs2_full_dnode *fn;
634 struct jffs2_full_dirent *fd;
635 int namelen;
636 union jffs2_device_node dev;
637 int devlen = 0;
638 uint32_t alloclen;
639 int ret;
640
641 if (!new_valid_dev(rdev))
642 return -EINVAL;
643
644 ri = jffs2_alloc_raw_inode();
645 if (!ri)
646 return -ENOMEM;
647
648 c = JFFS2_SB_INFO(dir_i->i_sb);
649
650 if (S_ISBLK(mode) || S_ISCHR(mode))
651 devlen = jffs2_encode_dev(&dev, rdev);
652
653 /* Try to reserve enough space for both node and dirent.
654 * Just the node will do for now, though
655 */
656 namelen = dentry->d_name.len;
657 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
658 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
659
660 if (ret) {
661 jffs2_free_raw_inode(ri);
662 return ret;
663 }
664
665 inode = jffs2_new_inode(dir_i, mode, ri);
666
667 if (IS_ERR(inode)) {
668 jffs2_free_raw_inode(ri);
669 jffs2_complete_reservation(c);
670 return PTR_ERR(inode);
671 }
672 inode->i_op = &jffs2_file_inode_operations;
673 init_special_inode(inode, inode->i_mode, rdev);
674
675 f = JFFS2_INODE_INFO(inode);
676
677 ri->dsize = ri->csize = cpu_to_je32(devlen);
678 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
679 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
680
681 ri->compr = JFFS2_COMPR_NONE;
682 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
683 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
684
685 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
686
687 jffs2_free_raw_inode(ri);
688
689 if (IS_ERR(fn)) {
690 /* Eeek. Wave bye bye */
691 mutex_unlock(&f->sem);
692 jffs2_complete_reservation(c);
693 ret = PTR_ERR(fn);
694 goto fail;
695 }
696 /* No data here. Only a metadata node, which will be
697 obsoleted by the first data write
698 */
699 f->metadata = fn;
700 mutex_unlock(&f->sem);
701
702 jffs2_complete_reservation(c);
703
704 ret = jffs2_init_security(inode, dir_i);
705 if (ret)
706 goto fail;
707
708 ret = jffs2_init_acl_post(inode);
709 if (ret)
710 goto fail;
711
712 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
713 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
714 if (ret)
715 goto fail;
716
717 rd = jffs2_alloc_raw_dirent();
718 if (!rd) {
719 /* Argh. Now we treat it like a normal delete */
720 jffs2_complete_reservation(c);
721 ret = -ENOMEM;
722 goto fail;
723 }
724
725 dir_f = JFFS2_INODE_INFO(dir_i);
726 mutex_lock(&dir_f->sem);
727
728 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
729 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
730 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
731 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
732
733 rd->pino = cpu_to_je32(dir_i->i_ino);
734 rd->version = cpu_to_je32(++dir_f->highest_version);
735 rd->ino = cpu_to_je32(inode->i_ino);
736 rd->mctime = cpu_to_je32(get_seconds());
737 rd->nsize = namelen;
738
739 rd->type = (mode & S_IFMT) >> 12;
740
741 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
742 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
743
744 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
745
746 if (IS_ERR(fd)) {
747 /* dirent failed to write. Delete the inode normally
748 as if it were the final unlink() */
749 jffs2_complete_reservation(c);
750 jffs2_free_raw_dirent(rd);
751 mutex_unlock(&dir_f->sem);
752 ret = PTR_ERR(fd);
753 goto fail;
754 }
755
756 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
757
758 jffs2_free_raw_dirent(rd);
759
760 /* Link the fd into the inode's list, obsoleting an old
761 one if necessary. */
762 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
763
764 mutex_unlock(&dir_f->sem);
765 jffs2_complete_reservation(c);
766
767 d_instantiate(dentry, inode);
768 unlock_new_inode(inode);
769 return 0;
770
771 fail:
772 iget_failed(inode);
773 return ret;
774 }
775
776 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
777 struct inode *new_dir_i, struct dentry *new_dentry)
778 {
779 int ret;
780 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
781 struct jffs2_inode_info *victim_f = NULL;
782 uint8_t type;
783 uint32_t now;
784
785 /* The VFS will check for us and prevent trying to rename a
786 * file over a directory and vice versa, but if it's a directory,
787 * the VFS can't check whether the victim is empty. The filesystem
788 * needs to do that for itself.
789 */
790 if (new_dentry->d_inode) {
791 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
792 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
793 struct jffs2_full_dirent *fd;
794
795 mutex_lock(&victim_f->sem);
796 for (fd = victim_f->dents; fd; fd = fd->next) {
797 if (fd->ino) {
798 mutex_unlock(&victim_f->sem);
799 return -ENOTEMPTY;
800 }
801 }
802 mutex_unlock(&victim_f->sem);
803 }
804 }
805
806
807 /* Make a hard link */
808
809 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
810 if (!type) type = DT_REG;
811
812 now = get_seconds();
813 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
814 old_dentry->d_inode->i_ino, type,
815 new_dentry->d_name.name, new_dentry->d_name.len, now);
816
817 if (ret)
818 return ret;
819
820 if (victim_f) {
821 /* There was a victim. Kill it off nicely */
822 drop_nlink(new_dentry->d_inode);
823 /* Don't oops if the victim was a dirent pointing to an
824 inode which didn't exist. */
825 if (victim_f->inocache) {
826 mutex_lock(&victim_f->sem);
827 if (S_ISDIR(new_dentry->d_inode->i_mode))
828 victim_f->inocache->pino_nlink = 0;
829 else
830 victim_f->inocache->pino_nlink--;
831 mutex_unlock(&victim_f->sem);
832 }
833 }
834
835 /* If it was a directory we moved, and there was no victim,
836 increase i_nlink on its new parent */
837 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
838 inc_nlink(new_dir_i);
839
840 /* Unlink the original */
841 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
842 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
843
844 /* We don't touch inode->i_nlink */
845
846 if (ret) {
847 /* Oh shit. We really ought to make a single node which can do both atomically */
848 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
849 mutex_lock(&f->sem);
850 inc_nlink(old_dentry->d_inode);
851 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
852 f->inocache->pino_nlink++;
853 mutex_unlock(&f->sem);
854
855 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
856 /* Might as well let the VFS know */
857 d_instantiate(new_dentry, old_dentry->d_inode);
858 atomic_inc(&old_dentry->d_inode->i_count);
859 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
860 return ret;
861 }
862
863 if (S_ISDIR(old_dentry->d_inode->i_mode))
864 drop_nlink(old_dir_i);
865
866 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
867
868 return 0;
869 }
Tomato firmware and modifications.